CN103940477A - Flow measuring device based on double-cantilever integrated vibration-compensation-type vortex street sensor - Google Patents
Flow measuring device based on double-cantilever integrated vibration-compensation-type vortex street sensor Download PDFInfo
- Publication number
- CN103940477A CN103940477A CN201410163671.XA CN201410163671A CN103940477A CN 103940477 A CN103940477 A CN 103940477A CN 201410163671 A CN201410163671 A CN 201410163671A CN 103940477 A CN103940477 A CN 103940477A
- Authority
- CN
- China
- Prior art keywords
- sensor
- cantilever
- lower house
- bluff body
- vibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 claims abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 8
- 239000010439 graphite Substances 0.000 claims abstract description 8
- 230000007935 neutral effect Effects 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000012530 fluid Substances 0.000 abstract description 4
- 239000013078 crystal Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Landscapes
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a flow measuring device based on a double-cantilever integrated vibration-compensation-type vortex street sensor. The flow measuring device comprises the double-cantilever integrated sensor, a graphite gasket, a lower shell, a sensor pressing block, a lower shell boss and a bluff body. The double-cantilever integrated sensor comprises two cantilever-type sensor bodies fixed to the same base, wherein one cantilever-type sensor body serves as a main sensor and is located in the downstream vortex street of the bluff body, the other cantilever-type sensor body serves as a compensation sensor and stretches into a small groove in the bluff body, same piezo-electric crystals are embedded into the sensor bodies respectively, the two sensor bodies are close to each other and used for sensing fluid vibration and pipeline vibration respectively, and a pipeline vibration signal in the main sensor is offset through charge compensation with the difference value between signals of the two sensor bodies as output. By means of the flow measuring device, the influence of pipeline vibration on flow measurement can be effectively eliminated or reduced on the premise that certain strength of output signals is guaranteed.
Description
Technical field
The present invention relates to a kind of vortex flow sensors, relate in particular to a kind of flow measurement device based on two cantilever Contiuum type vibration compensation type vortex street sensors.
Background technology
Piezoelectric vortex flowmeter, due to the advantage such as simple in structure, measuring accuracy is high, range ability is wide, develops into the leading products of fields of measurement gradually.But because the detecting element of piezoelectric type vortex flow sensors is force sensing element, more responsive to force rate, be vulnerable to the impact of the undesired signals such as pipe vibration, so its vibration resistance is very poor.And the pipe vibration phenomenon of industry spot is very general, thereby cause the inaccurate of flow measurement.Therefore, improve the vibration resistance of vortex flow sensors, fundamentally eliminate or reduce the interference of vibration, most important to the Measurement accuracy of flow.
Although the at present domestic and international poor problem of counter stress formula vortex street sensor vibration resistance has proposed some and has improved one's methods, but, due to some factors of the aspects such as processing and use, these methods are difficult to reach ideal effect in actual use, and also do not have a kind of method can make flowmeter have antivibration effect to the pipe vibration of six-freedom degree at present.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of flow measurement device based on two cantilever Contiuum type vibration compensation type vortex street sensors is provided.
The object of the invention is to be achieved through the following technical solutions, based on a flow measurement device for two cantilever Contiuum type vibration compensation type vortex street sensors, comprising: two cantilever Contiuum type sensors, Graphite pad, lower house, sensor briquetting, lower house boss, bluff body; Described pair of cantilever Contiuum type sensor comprises a sensor base, in described sensor base, have two through holes, two cantilever sensors are inserted and secured on respectively on two through holes, each cantilever sensor inside has a cavity, cavity inside is buried underground by two piezoelectric elements and a detecting element that neutral axis forms, two piezoelectric elements are symmetrically distributed in the both sides of neutral axis, and are closely connected with neutral axis, fill casting glue in cavity; Described bluff body is welded on lower house, the breech face of bluff body is positioned at the axial centre position place of lower house, have a groove at the top of lower house, lower house boss is fixed on this groove, center at lower house boss and lower house all has groove, on bluff body, open sulculus in a bluff body, on lower house boss, be equipped with Graphite pad, two cantilever Contiuum type sensors insert in the groove of lower house boss and lower house, and one of them cantilever sensor inserts in the interior sulculus of bluff body, and another cantilever sensor inserts in the passage of lower house; Sensor briquetting covers in sensor base and with lower house boss and is fixedly connected with.
The invention has the beneficial effects as follows, in the time of flow measurement, can be good at eliminating or the impact on flow signal of the pipe vibration noise that reduces six-freedom degree based on flow measurement device of the present invention, realize the Measurement accuracy of flow.
Brief description of the drawings
Fig. 1 is flow measurement device structural representation of the present invention;
Fig. 2 is the two cantilever Contiuum type sensor construction schematic diagram of the present invention;
Fig. 3 is the two cantilever Contiuum type sensor internal sectional views of the present invention;
Fig. 4 is the two cantilever Contiuum type sensors of the present invention piezoelectric element distortion schematic diagram while being subject to vortex street power;
Fig. 5 is the two cantilever Contiuum type sensors of the present invention piezoelectric element distortion schematic diagram while being subject to vortex street direction vibration force.
In figure, sulculus 6a in two cantilever Contiuum type sensors 1, Graphite pad 2, lower house 3, sensor briquetting 4, lower house boss 5, bluff body 6, sensor base 1a, cantilever sensor 1b, piezoelectric element 1c, neutral axis 1d, cavity 1e, bluff body.
Embodiment
The cantilever sensor 1b profile of a pair of disjunctor of the present invention, structure, size, material are identical, and for strengthen to pipeline the vibration resistance along vertical axes whirling vibration as far as possible, both are at a distance of nearer.In each cantilever sensor 1b, have a cavity 1e, bury respectively one group of identical piezoelectric detection element underground, every group of detecting element is made up of a neutral axis 1d and a pair of thin strip piezoelectric element 1c that is symmetrically distributed in neutral axis both sides.
The present invention will stretch into cantilever sensor 1b in pipeline inner fluid as master reference, experience vortex signal and pipe vibration signal simultaneously, cantilever sensor 1b sensor by way of compensation in sulculus 6a in the bluff body of bluff body 6 will be stretched into, only experience pipe vibration signal and can not experience vortex signal, using the signal difference of two sensors as output, mix the pipe vibration signal in vortex signal thereby offset in master reference.Because the shape and structure of two sensors is identical, and the tail end of sulculus 6a and outside connection make two sensors in same medium and have identical damping in bluff body, so pipeline is had to identical response along the vibration of vertical axes whirling vibration five degree of freedom in addition, and vibration noise can be eliminated completely.Along vertical axes whirling vibration, because two sensor distance are nearer, also can reduce to a certain extent though can not eliminate completely the impact that this degree of freedom is vibrated to pipeline.
Anti-vibration principle: in the time that fluid flows in pipeline, produce vortex alternately in bluff body both sides, make sensor bottom in vortex by the frequency left and right alternatively swinging of vortex pulse, one of piezoelectric element in sensor is received force of compression, another receives tensile force, and then on two piezoelectric elements, produce alternation periodically opposite polarity electric charge+Q and-Q, as shown in Figure 4.In the time there is no pipe vibration, compensation sensor impression, less than the effect of vortex street power, does not produce electric charge, and the electric charge frequency of master reference output is the vortex street pulsed frequency of reflection rate of flow of fluid.In the time that pipeline exists the vibration of vortex direction, the piezoelectric element strain of the piezoelectric element of master reference and compensation sensor is identical, and the charge variation of generation is also identical, can eliminate the interference of vibration noise completely, as shown in Figure 5 in principle.In the time that pipeline exists along the whirling vibration of vertical axes, stretching or flexible stress direction that the piezoelectric element of master reference is subject to the piezoelectric element of compensation sensor are consistent, but because there is distance L, its rotating torque is incomplete same, so the strain of piezoelectric element is not exclusively the same, the vibration noise of this direction can not be eliminated completely but can be weakened.In the time that pipeline exists the vibration of other degree of freedom, similar with the vibration of vortex direction.
As shown in Fig. 1 ~ 3, a kind of flow measurement device based on two cantilever Contiuum type vibration compensation type vortex street sensors of the present invention, comprising: two cantilever Contiuum type sensors 1, Graphite pad 2, lower house 3, sensor briquetting 4, lower house boss 5, bluff body 6, described pair of cantilever Contiuum type sensor 1 comprises a sensor base 1a, on described sensor base 1a, have two through holes, two cantilever sensor 1b are inserted and secured on respectively on two through holes, each cantilever sensor 1b inside has a cavity 1e, cavity 1e buries underground inside by two piezoelectric element 1c and a detecting element that neutral axis 1d forms, two piezoelectric element 1c are symmetrically distributed in the both sides of neutral axis 1d, and are closely connected with neutral axis 1d, fill casting glue in cavity 1e, described bluff body 6 is welded on lower house 3, the breech face of bluff body 6 is positioned at the axial centre position place of lower house 3, have a groove at the top of lower house 3, lower house boss 5 is fixed on this groove, center at lower house boss 5 and lower house 3 all has groove, on bluff body 6, open sulculus 6a in a bluff body, on lower house boss 5, be equipped with Graphite pad 2, two cantilever Contiuum type sensors 1 insert in the groove of lower house boss 5 and lower house 3, and one of them cantilever sensor 1b inserts in the interior sulculus 6a of bluff body, and another cantilever sensor 1b inserts in the passage of lower house 3, sensor briquetting 4 covers on sensor base 1a and with lower house boss 5 and is fixedly connected with, and realizes fixing two cantilever Contiuum type sensors 1.
As shown in Figure 1, the course of work of the present invention is as follows:
In use, the flow measurement device that the present invention is based on two cantilever Contiuum type vibration compensation type vortex street sensors is placed in pipeline, one of them cantilever sensor 1b is positioned at bluff body 6 vortex regions, downstream as master reference, another cantilever sensor 1b stretches in the bluff body of bluff body 6 in sulculus 6a sensor by way of compensation, and the axis of these two sensors is vertical with lower house axis.Master reference is experienced vortex signal and pipe vibration signal simultaneously, compensation sensor can only be experienced pipe vibration signal, using the difference of two cantilever sensor 1b as output, the electric charge that compensation sensor produces falls the charge cancellation producing because of vibration interference in master reference, thereby obtains flow signal.
Claims (1)
1. the flow measurement device based on two cantilever Contiuum type vibration compensation type vortex street sensors, it is characterized in that, comprising: two cantilever Contiuum type sensors (1), Graphite pad (2), lower house (3), sensor briquetting (4), lower house boss (5), bluff body (6), described pair of cantilever Contiuum type sensor (1) comprises a sensor base (1a), in described sensor base (1a), have two through holes, two cantilever sensors (1b) are inserted and secured on respectively on two through holes, each cantilever sensor (1b) inside has a cavity (1e), cavity (1e) inside is buried the detecting element being made up of two piezoelectric elements (1c) and a neutral axis (1d) underground, two piezoelectric elements (1c) are symmetrically distributed in the both sides of neutral axis (1d), and be closely connected with neutral axis (1d), in cavity (1e), fill casting glue, described bluff body (6) is welded on lower house (3), the breech face of bluff body (6) is positioned at the axial centre position place of lower house (3), top at lower house (3) has a groove, lower house boss (5) is fixed on this groove, center at lower house boss (5) and lower house (3) all has groove, on bluff body (6), open sulculus in a bluff body (6a), on lower house boss (5), be equipped with Graphite pad (2), two cantilever Contiuum type sensors (1) insert in the groove of lower house boss (5) and lower house (3), and one of them cantilever sensor (1b) inserts in the interior sulculus (6a) of bluff body, and another cantilever sensor (1b) inserts in the passage of lower house (3), sensor briquetting (4) covers upper in sensor base (1a) and is fixedly connected with lower house boss (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410163671.XA CN103940477A (en) | 2014-04-22 | 2014-04-22 | Flow measuring device based on double-cantilever integrated vibration-compensation-type vortex street sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410163671.XA CN103940477A (en) | 2014-04-22 | 2014-04-22 | Flow measuring device based on double-cantilever integrated vibration-compensation-type vortex street sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103940477A true CN103940477A (en) | 2014-07-23 |
Family
ID=51188244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410163671.XA Pending CN103940477A (en) | 2014-04-22 | 2014-04-22 | Flow measuring device based on double-cantilever integrated vibration-compensation-type vortex street sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103940477A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218932A (en) * | 2017-06-03 | 2017-09-29 | 中北大学 | Towards the common mode inhibition vibration compensation sensor construction of MEMS turbulence detectings |
-
2014
- 2014-04-22 CN CN201410163671.XA patent/CN103940477A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107218932A (en) * | 2017-06-03 | 2017-09-29 | 中北大学 | Towards the common mode inhibition vibration compensation sensor construction of MEMS turbulence detectings |
| CN107218932B (en) * | 2017-06-03 | 2019-09-20 | 中北大学 | Common mode inhibition vibration compensation sensor structure towards MEMS turbulence detecting |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| MX2018008697A (en) | Improved beam shaping acoustic signal travel time flow meter. | |
| CN101995272B (en) | Vortex street flowmeter with anti-vibration structure | |
| CN202092684U (en) | Diaphragm capsule type double-probe vortex street flow meter | |
| CN102798419A (en) | Ultrasonic flow sensor | |
| CN204944558U (en) | A kind of novel vortex street flowmeter | |
| CN103940477A (en) | Flow measuring device based on double-cantilever integrated vibration-compensation-type vortex street sensor | |
| CN100487394C (en) | Pipeline fluid noise auxiliary measuring device | |
| CN201476817U (en) | Vortex flowmeter with integrated vibration resistant structure | |
| CN103245384B (en) | Ultrasonic flow gas chamber for ultrasonic gas meter | |
| CN202770480U (en) | Ultrasonic flow sensor | |
| CN203116781U (en) | Onion head type vibration tube used for Coriolis flowmeter | |
| CN203893894U (en) | Flexible body based vortex shedding flowmeter | |
| CN202853663U (en) | Improved precession vortex flow meter | |
| CN206959928U (en) | A kind of layout structure of quadraphonic probe | |
| CN204575676U (en) | A kind of ultrasonic device for measuring flow rate of liquid | |
| CN201622083U (en) | Three-probe type rotating vortex flow meter | |
| CN203216542U (en) | Novel plug-in type vortex street flowmeter | |
| CN204142306U (en) | A kind of ultrasonic calorimeter flowtube | |
| CN207162136U (en) | A kind of underground pipeline detection means | |
| CN103968897A (en) | Vortex shedding flowmeter device based on flexible body | |
| CN101349296A (en) | Hydraulic system power measuring device based on MEMS reducing pipe flow sensor | |
| CN202092695U (en) | External-clamping ultrasonic sensor | |
| CN201429435Y (en) | Ultrasonic wave flow sensor | |
| CN100424474C (en) | Externally-connected inductive flow sensor | |
| CN205679356U (en) | Sonic method thermal cup vacuum degree detection method assay device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140723 |
|
| WD01 | Invention patent application deemed withdrawn after publication |